/Engine/Plugins/AI/MassAI/Source/MassNavigation/Public/MassNavigationSubsystem.h
[EMassNavigationObstacleFlags](API\Plugins\MassNavigation\EMassNavigationObstacleFlags) & operator&= ( [EMassNavigationObstacleFlags](API\Plugins\MassNavigation\EMassNavigationObstacleFlags) & Lhs, [EMassNavigationObstacleFlags](API\Plugins\MassNavigation\EMassNavigationObstacleFlags) Rhs )